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3:50 AM
It seems that tag has been created recently, the tag-creator provided even the tag-wiki.
Previous discussion on meta (with consensus not to create such tag):
3
Q: Would a new tag for mistakes/typos/errata for books be useful/appropriate?

Martin SleziakMaybe it could be called book-errata? I cannot give many examples of discussions from math.SE offhand but at least one example from here https://math.stackexchange.com/questions/34641/find-limit-of-unknown-function This is an example from a different forum: http://www.sosmath.com/CBB/viewtopic....

 
 
7 hours later…
10:54 AM
The tag for questions about proper classes has been created and removed before:
Mar 25 '13 at 19:46, by Martin Sleziak
The tag was created in this question. There was a new question about classes, and since the tag already existed, I've added it.
Today in this question the tag was created again, but quickly removed by Asaf.
 
 
2 hours later…
1:14 PM
6
A: Tag management 2017

Michael Albanese Resolved. Tags merged and synonym spinor$\to$spin-geometry created. Proposal: Rename spinor to "spin-geometry". Most of the questions with the spinor tag are really about spin geometry; spinors are just a particular aspect of spin geometry. It currently isn't clear if one should use t...

 

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